How do you train sailors to save a sinking ship? Sure, you can teach them the theory, but there's no replacement for having to hammer softwood wedges into deck and bulkhead splits that are spraying cold, high-pressure water in your face.

At HMS Excellent in Portsmouth sits Hazard, a Royal Navy Damage Repair Instructional Unit (DRIU). Every Navy recruit who's going out to sea will have to go through something like this -- and on a much harder level than we did! But then, they'll have had months of training and teamwork beforehand...